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I've installed wheezy + the latest debian skype (v4.2.013)
in skype: options->video devices>ticked "enable skype video" and getting "no devices found" in pulldown menu
I have installed v4l and I have set
in the bash env (via .bashrc)
webcam works flawlessly when I boot into W7. The machine is a vaio x laptop.
In debian the lib is in /usr/lib/i386-linux-gnu/libv4l/v4l1compat.so or /usr/lib/x86_64-linux-gnu/libv4l/v4l1compat.so depending on which version you're running. And assuming that package libv4l-0 is installed.
Another method beside LD_PRELOAD is to add a .conf in /etc/ld.so.conf.d/ with the path to the lib and run ldconfig. LD_PRELOAD is the option used if you don't have root permissions. So for debian, not mint, it would go something like.
Basically accomplishes the same LD_PRELOAD bit without having to use LD_PRELOAD. And opens up the known libs to look there for requested libs. Java needs a similar workaround to know where the java libs are so pulseaudio functions properly. Or functions less unproperly.
Perhaps strace skype to see what libs it's trying to use and hold it's hand so it'll find them. Like java it might need help to find it's own libs. You may also need to do some v4l2-ctl fiddling to set the webcam in a mode that skype likes. I used to have to run tvtime first to use my tvcapture card, until I figured out that "v4l2-ctl -f 61.25" accomplished the same thing. As in sets the analog tv capture card to channel 3.
Probably start with colorspace and resolution. Sticking with common attributes like 640x480, 1280x720, 1920x1080, yuv420p, mjpeg or whatever works. A little skype research could help. And knowing the capabilities of the device.
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : UVC Camera (05ca:18b6)
Bus info : usb-0000:00:1d.7-8
Driver version: 3.2.51
Capabilities : 0x04000001
Format Video Capture:
Width/Height : 640/480
Pixel Format : 'YUYV'
Field : None
Bytes per Line: 1280
Size Image : 614400
Colorspace : Unknown (00000000)
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 640, Height 480
Default : Left 0, Top 0, Width 640, Height 480
Pixel Aspect: 1/1
Video input : 0 (Camera 1: ok)
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 0
Try a different version of skype? Try a different distro. Wheezy has it's perks, but for all practical purposes it's 2+ years old on the day it's released. Lots of things are different graphically since a 3.2.x kernel. Debian jessie / sid runs a 3.13.x kernel at the moment which works pretty stellarly with my ati-legacy hardware. Where dealing with a 3.2.x kernel (wheezy) would involve a few compromises. Like proprietary graphics drivers that are basically deprecated since kernels > 3.4.x for ati-legacy cards.